Cryogenic air separation system for enhanced liquid production
a technology of cryogenic air separation and liquid production, which is applied in the direction of stationary conduit assemblies, lighting and heating apparatus, solidification, etc., can solve the problem of very energy-intensive cryogenic air separation process
Active Publication Date: 2009-05-19
PRAXAIR TECH INC
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AI Technical Summary
Benefits of technology
This approach reduces energy consumption and enhances the production of liquid products by optimizing refrigeration use, enabling efficient operation in both low and high liquid producing modes while maintaining effective separation of nitrogen, oxygen, and argon.
Problems solved by technology
Cryogenic air separation is a very energy intensive process because of the need to generate low temperature refrigeration to drive the process.
This is particularly the case where large amounts of liquid product are recovered which necessarily removes large amounts of refrigeration from the system.
Method used
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Embodiment Construction
[0019]In general, the invention is a method for operating a cryogenic air separation plant wherein a gas stream, which may be feed air or nitrogen-enriched vapor from the higher pressure column, and having a temperature generally within the range of from 125K to 200K, more preferably from 140K to 190K, is turboexpanded through a first turbine, termed the cold turbine, to a pressure no greater than 3 pounds per square inch (psi) higher than the operating pressure of the lower pressure column. The discharge from the cold turbine is passed into the lower pressure column and / or vented to the atmosphere or recovered as product. During at least some of the time that the cold turbine is operating, a feed air stream having a temperature generally within the range of from 200K to 320K, more preferably from 280K to 320K, is turboexpanded through a second turbine, termed the warm turbine, to a pressure no lower than the operating pressure of the higher pressure column. The discharge from the w...
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A system for separating air by cryogenic rectification whereby liquid production is increased by employing two separate turboexpanders, one which exhausts at a pressure no higher than that sufficient to feed the lower pressure column, the other which exhausts at a pressure no lower than that sufficient to feed the higher pressure column, and wherein one of the turboexpanders is fed with ambient temperature or modestly cooled feed air and preferably operates intermittently depending upon whether greater or lesser amounts of liquid product are desired.
Description
TECHNICAL FIELD[0001]This invention relates generally to cryogenic air separation and, more particularly, to cryogenic air separation for producing enhanced amounts of liquid product.BACKGROUND ART[0002]Cryogenic air separation is a very energy intensive process because of the need to generate low temperature refrigeration to drive the process. This is particularly the case where large amounts of liquid product are recovered which necessarily removes large amounts of refrigeration from the system. Accordingly, a method for operating a cryogenic air separation plant which enables efficient operation in a low liquid producing mode as well as in a high liquid producing mode would be very desirable.SUMMARY OF THE INVENTION[0003]A method for operating a cryogenic air separation plant employing a double column having a higher pressure column and a lower pressure column comprising:[0004](A) passing a first gas stream having a temperature within the range of from 125K to 200K to a cold turb...
Claims
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IPC IPC(8): F25J3/00
CPCF25J3/0409F25J3/042F25J3/04296F25J3/04303F25J3/04387F25J3/04969F25J3/04412F25J3/04678F25J3/04393F25J2240/10F25J2290/10F25J3/00F25J3/04F28B1/00F28D5/02
Inventor PROSSER, NEIL MARK
Owner PRAXAIR TECH INC